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Altered global brain signal in schizophrenia.


ABSTRACT: Neuropsychiatric conditions like schizophrenia display a complex neurobiology, which has long been associated with distributed brain dysfunction. However, no investigation has tested whether schizophrenia shows alterations in global brain signal (GS), a signal derived from functional MRI and often discarded as a meaningless baseline in many studies. To evaluate GS alterations associated with schizophrenia, we studied two large chronic patient samples (n = 90, n = 71), comparing them to healthy subjects (n = 220) and patients diagnosed with bipolar disorder (n = 73). We identified and replicated increased cortical power and variance in schizophrenia, an effect predictive of symptoms yet obscured by GS removal. Voxel-wise signal variance was also increased in schizophrenia, independent of GS effects. Both findings were absent in bipolar patients, confirming diagnostic specificity. Biologically informed computational modeling of shared and nonshared signal propagation through the brain suggests that these findings may be explained by altered net strength of overall brain connectivity in schizophrenia.

SUBMITTER: Yang GJ 

PROVIDER: S-EPMC4034208 | biostudies-other | 2014 May

REPOSITORIES: biostudies-other

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Altered global brain signal in schizophrenia.

Yang Genevieve J GJ   Murray John D JD   Repovs Grega G   Cole Michael W MW   Savic Aleksandar A   Glasser Matthew F MF   Pittenger Christopher C   Krystal John H JH   Wang Xiao-Jing XJ   Pearlson Godfrey D GD   Glahn David C DC   Anticevic Alan A  

Proceedings of the National Academy of Sciences of the United States of America 20140505 20


Neuropsychiatric conditions like schizophrenia display a complex neurobiology, which has long been associated with distributed brain dysfunction. However, no investigation has tested whether schizophrenia shows alterations in global brain signal (GS), a signal derived from functional MRI and often discarded as a meaningless baseline in many studies. To evaluate GS alterations associated with schizophrenia, we studied two large chronic patient samples (n = 90, n = 71), comparing them to healthy s  ...[more]

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